package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //判断当前商品是否在购物车中
       List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if (shoppingCartList != null && shoppingCartList.size() > 0){
             //如果已经存在，更新数量，数量就增加1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart);

        } else{
            //如果不存在，插入数据 数量就为1
            //判断当前添加到购物的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null ){
                //添加购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //如果添加的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        return shoppingCartMapper.list(shoppingCart);
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    @Override
//    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
//        //获取当前微信用户id
//        Long userId = BaseContext.getCurrentId();
//        //根据dishId或者setmealId查询购物车
//        Long dishId = shoppingCartDTO.getDishId();
//        ShoppingCart shoppingCart = new ShoppingCart();
//        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
//        shoppingCart.setUserId(userId);
//
//        if(shoppingCart.getDishId() != null){
//            //当前商品为菜品
//            ShoppingCart cart = shoppingCartMapper.getByUserIdAndDishId(shoppingCart);
//            //如果购物车中商品数量大于1 则对应商品数量减少1
//            cart.setNumber(cart.getNumber() - 1);
//
//            if(cart.getNumber() == 0){
//                //如果减少后购物车中商品数量等于0 则删除购物车中的商品数据
//                shoppingCartMapper.deleteById(cart.getId());
//            }else {
//                //如果减少后购物车中商品数量>=1 则跟新购物车中的商品数据
//                shoppingCartMapper.updateNumberById(cart);
//            }
//        }else {
//            //当前商品为套餐
//            ShoppingCart cart = shoppingCartMapper.getByUserIdAndSetmealId(shoppingCart);
//            //如果购物车中商品数量大于1 则对应商品数量减少1
//            cart.setNumber(cart.getNumber() - 1);
//
//            if(cart.getNumber() == 0){
//                //如果减少后购物车中商品数量等于0 则删除购物车中的商品数据
//                shoppingCartMapper.deleteById(cart.getId());
//            }else {
//                //如果减少后购物车中商品数量>=1 则跟新购物车中的商品数据
//                shoppingCartMapper.updateNumberById(cart);
//            }
//        }
//    }
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size()>0) {
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
